Death of Rob Knox: How much did movie role contribute?

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The movie 'Harry Potter' has generated a lot of controversies especially amongst spiritual fathers. You see the children calling themselves witches and wizards and flying in brooms. The death of one of the actors Rob Knox, was a very sad event. From what I hear, he was to play an important role in which he was also murdered in the movie. My question is this, how much did superstition or this movie contribute to his death. I have seen some actors who play role of drunkards in movie actually becoming drunks after the movie even though they were never known to be alcoholics before. Some end up become drug addicts just because they play that role even though they were never known to have been using drugs before they star in the movie. There is this particular African movie, 'The Gods Are Not To Blame' in which the protagonist killed his own father and married his own mother. In real life, he did kill his brother and married the wife. I may sound superstitious here, plz forgive me. But I mean what I am saying. the only difference between the examples I have given and the death of Rob Knox is that he was billed to play that role of a street brawl where he was murdered. So how much does movie role contribute to the death of Rob Knox?